On Nov 6, 2009, at 4:14 AM, Porscha Louise McRobbie wrote:
> Hello,
>
> Can anyone explain why the following simple plot is a single color?
>
> SphericalPlot3D[Abs[Cos[t]], {t, 0, Pi}, {p, -Pi, Pi},
> ColorFunction -> Function[{t}, Hue[Arg[Cos[t]]/(2. Pi)]],
> ColorFunctionScaling -> False]
>
> Arg[Cos[t]]/(2. Pi)] should be zero for t<Pi/2, and 0.5 for t>Pi/2, so
> I expect the the upper lobe of the plot to be red (Hue[0]) and the
> lower lobe to be cyan (Hue[0.5]). Is there something different about
> ColorFunctions in SphericalPlot3D compared with Plot3D?
>
> Any help is greatly appreciated!
You want: ColorFunction -> Function[{x, y, z, t, p, r},
Hue[Arg[Cos[t]]/(2. Pi)]]
Even though you refer to it as t, the parameter in your function is
being passed the x values.
Brett Champion
Wolfram Research